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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="preprocessor">#ifndef QQTSHAREDMEMORY_H</span></div><div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="preprocessor">#define QQTSHAREDMEMORY_H</span></div><div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;</div><div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="preprocessor">#include &lt;QSharedMemory&gt;</span></div><div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="preprocessor">#include &lt;qqt-local.h&gt;</span></div><div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="preprocessor">#include &lt;qqtcore.h&gt;</span></div><div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="preprocessor">#include &lt;qqtmessage.h&gt;</span></div><div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;</div><div class="line"><a name="l00039"></a><span class="lineno"><a class="line" href="class_q_qt_shared_memory.html">   39</a></span>&#160;<span class="keyword">class </span>QQTSHARED_EXPORT <a class="code" href="class_q_qt_shared_memory.html">QQtSharedMemory</a> : <span class="keyword">public</span> QSharedMemory</div><div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;{</div><div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;    Q_OBJECT</div><div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;<span class="keyword">public</span>:</div><div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;    <span class="keyword">explicit</span> <a class="code" href="class_q_qt_shared_memory.html">QQtSharedMemory</a> ( <span class="keyword">const</span> QString&amp; key, QObject* parent = Q_NULLPTR ) : QSharedMemory ( key, parent ) {</div><div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;</div><div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;    }</div><div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;    ~<a class="code" href="class_q_qt_shared_memory.html">QQtSharedMemory</a>() {}</div><div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;</div><div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;    <span class="comment">//需要重写，改变共享内存块大小。</span></div><div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;    <span class="keyword">virtual</span> <span class="keywordtype">void</span> initializer() {</div><div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;        <span class="comment">//user set payload size.</span></div><div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;        <span class="comment">//这个只需要调用一次，但是调用多次也正常使用。我在这个教程父类里面给的是1024.子类可变可改。这个是最大约束，万万不能超过。</span></div><div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;        create ( 1024 );</div><div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;        <span class="comment">//这个每个变量都必须调用！是这个函数保证data()指针有数的。</span></div><div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;        attach();</div><div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;    }</div><div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;</div><div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;    <span class="comment">//需要重写，实现把局部变量打包到共享内存块。（注释部分。）</span></div><div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;    <span class="comment">//这个函数保证写入共享内存。</span></div><div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;    <span class="keyword">virtual</span> <span class="keywordtype">void</span> packer() {</div><div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;        lock();</div><div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;</div><div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;        <span class="comment">//user data struct</span></div><div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;        QByteArray bytes;</div><div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;        <span class="comment">//bytes &lt;&lt; a;</span></div><div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;</div><div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;        <span class="comment">//这个是无论如何不应该发生的，用户在申请空间的时候应当申请足够的以供变动的空间。</span></div><div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;        <span class="keywordflow">if</span> ( bytes.size() &gt; size() ) {</div><div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;            pline() &lt;&lt; <span class="stringliteral">&quot;bytes size out payload..., create more...&quot;</span>;</div><div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;            unlock();</div><div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;            <span class="keywordflow">return</span>;</div><div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;        }</div><div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;        memcpy ( data(), bytes.constData(), bytes.size() );</div><div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;        unlock();</div><div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;    }</div><div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;</div><div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;    <span class="comment">//需要重写，实现把共享内存块解压到局部变量。（注释部分。）</span></div><div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;    <span class="comment">//这个函数保证从共享内存读取。</span></div><div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;    <span class="keyword">virtual</span> <span class="keywordtype">void</span> parser() {</div><div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;        lock();</div><div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;        QByteArray bytes;</div><div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;        bytes.resize ( size() );</div><div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;        memcpy ( bytes.data(), data(), size() );</div><div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;</div><div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;        <span class="comment">//user data struct</span></div><div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;        <span class="comment">//bytes &gt;&gt; a;</span></div><div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;</div><div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;        unlock();</div><div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;    }</div><div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;</div><div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;    <span class="comment">/*以下函数提供操作方便。*/</span></div><div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;</div><div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;    QByteArray readShortString ( QByteArray&amp; bytes ) {</div><div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;        quint16 s0;</div><div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;        QByteArray str;</div><div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;        bytes &gt;&gt; s0;</div><div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;        str.resize ( s0 );</div><div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;        bytes &gt;&gt; str;</div><div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;        <span class="keywordflow">return</span> str;</div><div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;    }</div><div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;</div><div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;    <span class="keywordtype">void</span> writeShortString ( QByteArray&amp; bytes, QByteArray&amp; shortString ) {</div><div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;        quint16 s0 = shortString.size();</div><div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;        bytes &lt;&lt; s0;</div><div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;        bytes &lt;&lt; shortString;</div><div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;    }</div><div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;</div><div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;    QByteArray readString ( QByteArray&amp; bytes ) {</div><div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;        quint32 s0;</div><div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;        QByteArray str;</div><div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;        bytes &gt;&gt; s0;</div><div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;        str.resize ( s0 );</div><div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;        bytes &gt;&gt; str;</div><div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;        <span class="keywordflow">return</span> str;</div><div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;    }</div><div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;</div><div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;    <span class="keywordtype">void</span> writeString ( QByteArray&amp; bytes, QByteArray&amp; shortString ) {</div><div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;        quint32 s0 = shortString.size();</div><div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;        bytes &lt;&lt; s0;</div><div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;        bytes &lt;&lt; shortString;</div><div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;    }</div><div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;</div><div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;signals:</div><div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160;</div><div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;<span class="keyword">public</span> slots:</div><div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;</div><div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;<span class="keyword">private</span>:</div><div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;};</div><div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;</div><div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;</div><div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;<span class="preprocessor">#endif //QQTSHAREDMEMORY_H</span></div><div class="ttc" id="class_q_qt_shared_memory_html"><div class="ttname"><a href="class_q_qt_shared_memory.html">QQtSharedMemory</a></div><div class="ttdoc">The QQtSharedMemory class 共享内存读写实现类。 允许可变长度的局部变量。 </div><div class="ttdef"><b>Definition:</b> qqtsharedmemory.h:39</div></div>
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